From which version captcha will be support by Firefox?

Hi,
I'm going to add captcha in my website. I want to know what is the lowest version of firefox support audio captcha. Is there any other plugins like JAVA to be added in client browser to view captcha?

Thanks

Hi,
I'm going to add captcha in my website. I want to know what is the lowest version of firefox support audio captcha. Is there any other plugins like JAVA to be added in client browser to view captcha?
Thanks

Which plugin is used to play this audio file?
Best would be to use a file that can be played buy the built-in HTML audio player via an audio tag to be independent of plugins.
*https://developer.mozilla.org/en/HTML/Element/audio
*https://developer.mozilla.org/en/Media_formats_supported_by_the_audio_and_video_elements